Even if u suck at Physics, . go for M1.,. I ain't so much good at physics. ( I suck big time )., but got an A ( Al-hamd-u-lillah ). in M1, si go for M1. it's really easy as compared with D1.
D1 is very much confusing.,.infact very very very ..... much confusing.,. my friend after repeating too got 33 ., and in others he got high A's , so What u expect..!!..